●Install the indoor unit more than 3.3' (1 m) away from any antenna or power lines or connecting wires used for tele- vision, radio, telephone, security system, or intercom.
Electrical noise from any of these sources may affect operation.
●install in a sturdy manner to avoid increased operating noise.
Table 3
| Max. | Max. Allowable Total |
| Limit of | Limit of Elevation | Required Amount | |
| Allowable | Tubing Length | Total Tubing Length | Difference | of Additional | ||
Model | Tubing Length | at shipment | (L1+L2+L3) or | (H1, H2, H3, H4) | Refrigerant | ||
| per unit | (L1+L2+L3) or | (L1+L2+L3+L4) | (ft.) | (oz./ft.)* | ||
| (ft.) | (L1+L2+L3+L4) |
| (ft.) |
|
| |
|
|
| (ft.) |
|
|
|
|
|
|
|
|
|
|
|
|
CMH1972 | 82 | 150 | (L1+L2+L3) | 150 | (L1+L2+L3) | 50 | — |
|
|
|
|
|
|
|
|
CMH2472 | 82 | 150 | (L1+L2+L3+L4) | 200 | (L1+L2+L3+L4) | 50 | 0.22 |
|
|
|
|
|
|
|
|
CMH3172 | 100 | 150 | (L1+L2+L3+L4) | 230 | (L1+L2+L3+L4) | 50 | 0.22 |
|
|
|
|
|
|
|
|
*If total tubing length becomes 150 to 200 ft. (Max.) or 150 to 230 ft. (Max.), charge additional refrigerant (R410A) by 0.22 oz./ft.
No additional charge of compressor oil is necessary. For more detailed charging information, refer to the Technical & Service Manual.
2-2. Embedding the Tubing and Wiring
●Before beginning embedding installation work, consult fully with agencies or offices related to the building’s foundation, construction, electricity, and water.
●Wait to make connections to the embedded portion. Each connection step is described later in this manual.
●Securely cover the end of the embedded tubing to prevent intrusion of dirt or moisture.
●If an embedded tube is to be left for a long time, fill the tube with nitrogen and seal both ends securely. If a tube is left open for an extended time, moisture in the air inside the tubing may condense into water droplets, and lead to water contamination of the refrig- erant circuit.
●In order to prevent insulation breakdown and ground faults, do not allow wiring ends to come in contact with rainwater, or be subjected to condensation or dew.
●Apply sufficient thermal insulation to the refrigerant tubing and drain pipes.
5
